//
// Created by 51165 on 2025/10/17.
//
#include <stdio.h>
int main() {
    int n = 0;
    scanf("%d", &n);
    int cnt = 0;
    do {
            cnt++;
            n /= 10;

    }while (n);
    printf("%d\n", cnt);
    return 0;
}